Liberalize the naming of the articles (and categories? but absolutely not templates), and at the same time require that all localized (non-English) articles have the language suffix added to their title, be it translated or not, including redirects

Templates should be coded so that they are language-neutral, with all their messages coded as {{{msg1|default English message}}}: non-English articles should use meta-templates that simply call the basic template localizing its messages: {{Template|msg1=localized message}}